US6533789B1 - Device for rotational stabilization of bone segments - Google Patents
Device for rotational stabilization of bone segments Download PDFInfo
- Publication number
- US6533789B1 US6533789B1 US09/542,821 US54282100A US6533789B1 US 6533789 B1 US6533789 B1 US 6533789B1 US 54282100 A US54282100 A US 54282100A US 6533789 B1 US6533789 B1 US 6533789B1
- Authority
- US
- United States
- Prior art keywords
- bone
- lag screw
- collar
- locking collar
- bone plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/74—Devices for the head or neck or trochanter of the femur
- A61B17/742—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck
- A61B17/746—Devices for the head or neck or trochanter of the femur having one or more longitudinal elements oriented along or parallel to the axis of the neck the longitudinal elements coupled to a plate opposite the femoral head
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S606/00—Surgery
- Y10S606/902—Cortical plate specifically adapted for a particular bone
Definitions
- the present invention relates generally to connection devices, and, more particularly, to a bone connection device for rotational stabilization of bone segments.
- Devices for the repair of large bone fractures have generally consisted of some combination of a lag screw with a side plate and some means for attaching these two components to one another and to the fractured bone segments.
- the ability to rotationally lock a lag screw (also known as a “hip screw”) relative to its side plate is very important in such devices because rotational movement of the lag screw relative to the side plate following implantation can cause premature wear of the bone fragment and result in loosening of the system prior to complete healing.
- the present invention is a device for rotational stabilization of bone segments
- a bone lag screw having a bone-engagement end, a distal end, and a keyed cross-sectional profile, the bone-engagement end configured for engaging a first bone segment
- a bone plate having a flat portion for engaging a second bone segment and a barrel portion having an internal bore for slidably receiving the lag screw
- a locking collar having a keyed internal profile that mates with the keyed cross-sectional profile of the lag screw to rotationally couple the locking collar and the lag screw when the lag screw is inserted through the locking collar, and an outer surface configured and dimensioned for (1) free rotation, in a first position, within the internal bore of the bone plate barrel portion and (2) frictionally engaging, in a second position, the internal bore of the bone plate barrel portion to resist or prevent rotation of the collar relative to the bone plate, and thereby resist or prevent rotation of the lag screw relative to the bone plate.
- the locking collar may be cylindrical, and the outer surface of the locking collar may be formed with a taper.
- the taper of the outer surface of the locking collar may range from about 0 degrees to about 10 degrees.
- the taper of the outer surface of the locking collar may be defined by a major diameter and a minor diameter, a distal end of the collar having the major diameter, and a proximal end of the collar having the minor diameter.
- the internal bore of the bone plate barrel portion may also be formed with a taper and the taper of the outer surface of the locking collar may be of the same degree and profile as the taper of the internal bore of the bone plate barrel portion.
- an impact force on the distal end of the locking collar frictionally locks the tapered outer surface of the locking collar to the tapered inner surface of the bone plate internal bore, preventing further rotation of the collar relative to the bone plate, and thereby preventing further rotation of the lag screw relative to the bone plate.
- This frictional locking is known as the Morse Taper effect.
- the components described above i.e., lag screw, bone plate, locking collar
- the outer surface of the locking collar may be formed with a reverse taper defined by a major diameter and a minor diameter, a proximal end of the collar having the major diameter, and a distal end of the collar having the minor diameter.
- the locking collar in the second position, may then be frictionally engaged in a proximal section of the internal bore of the bone plate by a force in a distal direction (i.e., a force directed away from, rather than toward, the patient's body), such as that applied with a slide-hammer.
- the barrel portion of the bone plate may be angled relative to the flat portion, and the device may be configured and adapted for repair of fractures of the femoral neck (i.e., hip bone). It should be pointed out, however, that the device is generally applicable to any type of bone fracture where rotational stabilization is important.
- the locking collar may be formed with a plurality of partial lengthwise slots extending from a distal end of the collar toward the proximal end of the collar.
- the lag screw may be formed with a cancellous screw thread, or it may be formed with a plurality of helically twisted blades.
- the device may further comprise a threaded bore in the distal end of the lag screw, and a compression screw insertable into the threaded bore of the lag screw.
- the compression screw When threaded into the threaded bore of the lag screw, the compression screw abuts a distal end of the locking collar and draws the lag screw in an axial direction to join the two bone segments and reduce the fracture.
- the compression screw may be formed of stainless steel, titanium alloy, or titanium.
- the invention is a device for rotational stabilization of bone segments comprising: a bone lag screw having a bone-engagement end and a distal end, the bone-engagement end configured for engaging a first bone segment; a bone plate having a flat portion for engaging a second bone segment and a barrel portion having an internal bore for slidably receiving the lag screw, part of the internal bore having a taper; and a cylindrical locking collar having a hollowed cylindrical interior, a keyed internal profile that mates with the keyed cross-sectional profile of the lag screw to rotationally couple the locking collar and the lag screw when the lag screw is inserted through the locking collar, and a tapered outer surface configured and dimensioned for (1) free rotation, in a first position, within the internal bore of the bone plate barrel portion and (2) frictionally engaging, in a second position, the internal bore of the bone plate barrel portion to resist or prevent rotation of the collar relative to the bone plate, and thereby resist or prevent rotation of the lag screw relative to the bone plate.
- the taper of the outer surface of the locking collar may range from about 0 degrees to about 10 degrees, and may be defined by a major diameter and a minor diameter, a distal end of the collar having the major diameter, and a proximal end of the collar having the minor diameter.
- the barrel portion of the bone plate may be angled relative to the flat portion, and the device may be configured and adapted for repair of fractures of the femoral neck (i.e., hip bone), but is generally applicable to any type of bone fracture where rotational stabilization is important.
- the components described above i.e., lag screw, bone plate, locking collar
- the locking collar may be formed with a plurality of partial lengthwise slots extending from the distal end of the collar toward the proximal end of the collar.
- the taper of the outer surface of the locking collar may be of the same degree and profile as the taper of the internal bore of the angled barrel portion.
- the outer surface of the locking collar may be formed with a reverse taper defined by a major diameter and a minor diameter, a proximal end of the collar having the major diameter, and a distal end of the collar having the minor diameter.
- the locking collar in the second position, may then be frictionally engaged in a proximal section of the internal bore of the bone plate by a force in a distal direction (i.e., a force directed away from, rather than toward, the patient's body), such as that applied with a slap-hammer.
- the device may further comprise a threaded bore in the distal end of the lag screw, and a compression screw insertable into the threaded bore of the lag screw.
- the compression screw When threaded into the threaded bore of the lag screw, the compression screw abuts the distal end of the locking collar and draws the lag screw in an axial direction to join the two bone segments and reduce the fracture.
- the compression screw may be formed of stainless steel, titanium alloy, or titanium.
- the invention provides an improved method for rotationally stabilizing bone segments utilizing a bone lag screw and a bone plate, the improvement comprising: sufficiently locking the bone screw to the bone plate by frictional engagement to rotationally stabilize the bone segments relative to one another.
- the method may further comprise: inserting a locking collar into a barrel portion of a bone plate; inserting a lag screw through the locking collar and barrel portion; rotationally coupling the locking collar and the lag screw; attaching the bone-engagement end of the lag screw to a first bone segment; and impacting the locking collar to frictionally engage an outer surface of the locking collar to the internal bore to resist or prevent further rotation of the collar relative to the bone plate, and thereby prevent further rotation of the lag screw relative to the bone plate.
- FIG. 1 is an isometric view of the disassembled components of the device in a preferred embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the bone plate and locking collar of the present invention.
- FIG. 3A is a cross-sectional view of the locking collar of the present invention.
- FIG. 3B is a plan view of the locking collar of the present invention.
- FIG. 4 is a cross-sectional view through a pair of bone segments demonstrating the application of the device of the present invention.
- FIG. 5 is a cross sectional view through a pair of bone segments demonstrating the application of another embodiment of the device of the present invention.
- FIG. 1 is an isometric view of the disassembled components of the device of the present invention.
- the device allows a lag screw (or hip screw) to be aligned and rotationally locked within the bore of a bone repair plate. While the device is described in the context of hip fracture repair, it should be pointed out that the device may also be used in the repair of other bone fractures, such as knee joint fractures.
- a side plate 10 has a flat portion 12 for attachment to the femur shaft (not shown) and an angled barrel portion 14 having an internal bore 16 .
- the flat portion 12 has holes 15 (which may be self-compressing screw holes) for connection to the femoral shaft using screws or other coupling means.
- the internal bore 16 is formed with a taper or cone, as will be explained below with reference to FIG. 2.
- a lag screw 18 has a drilling portion 20 at a bone-engagement end and a threaded internal bore 22 at a distal end.
- the lag screw 18 may be formed with a conventional cancellous screw thread 46 (as shown in FIG. 5 ), or may be formed with a plurality of helically twisted blades (as shown in FIG.
- proximal and distal are defined with relation to the body of the patient (i.e., the person receiving the bone stabilization device).
- proximal is used to describe that portion of a given element closer to the center of the patient's body, and the term “distal” refers to that portion of the element further away from the center of the patient's body.
- a locking collar 24 has a hollow cylindrical interior and an outer surface 26 formed with a taper.
- the taper of the outer surface 26 of locking collar 24 ranging from about 0 degrees to about 10 degrees, is of the same degree and profile as the taper of the internal bore 16 .
- the locking collar 24 also has a circumferential lip 28 (see FIG. 3A) at a distal end that mates with a circumferential groove 30 at a distal end of the internal bore 16 .
- the circumferential lip 28 engages the circumferential groove 30 , such that the collar is axially restrained in the bore, but is free to rotate with respect to the bore.
- the bone stabilization device may be supplied to physicians with the locking collar already engaged in the circumferential groove 30 of the bone plate internal bore 16 .
- the locking collar also has a keyed internal profile, as will be explained below with reference to FIG. 3B, that mates with a keyed cross-sectional profile 32 on the shaft of the lag screw 18 , to rotationally couple the locking collar 24 to the lag screw 18 when the lag screw is inserted through the internal bore 16 and the locking collar 24 .
- the locking collar 24 also facilitates the proper alignment of the lag screw 18 and side plate 10 , while simultaneously permitting the screw 18 to rotate freely so that it can engage the bone segment during installation. This integral alignment function of the locking collar 24 eliminates the need for additional components or alignment tools.
- the bore may have a reverse taper, as compared to that of the embodiment illustrated in the figures herein.
- the bore has its major diameter at the proximal end, its minor diameter at the distal end, and the collar 24 is locked in place at the proximal end of the internal bore 16 by a force in the distal direction, such as that applied by a slide-hammer.
- a compression screw 34 may be inserted into the threaded bore 22 of the lag screw, abutting the distal end of the locking collar 24 and drawing the lag screw axially in the distal direction, to join the separated bone segments (i.e., reducing the fracture) and promote the desired healing.
- the elements described above may be formed of stainless steel, titanium alloy, titanium, or any other material with suitable strength and bio-compatibility.
- FIG. 2 is a cross-sectional view of the side plate and locking collar of the present invention.
- the side plate 10 has a flat portion 12 for connection to the femoral shaft and an angled barrel portion 14 having an internal bore 16 for slidably receiving a lag screw (not shown).
- the bore 16 has a tapered surface 17 along part of its length.
- a locking collar 24 sits within the internal bore 16 , a circumferential lip 28 on the collar 24 rotatably engaging a circumferential groove 30 on the bore 16 .
- the collar 24 has a tapered outer surface 26 , with the same degree and profile as the tapered surface 17 of internal bore 16 .
- the collar Prior to insertion and alignment of the lag screw (not shown) and application of an impact force to the distal end 19 of the collar, the collar can rotatably slide within the bore 16 .
- the collar 24 has a keyed internal profile 21 , as shown most clearly in FIG. 3B, for mating and rotationally coupling with a corresponding keyed cross-sectional profile of the lag screw.
- rotation of the lag screw causes rotation of the locking collar 24 relative to the bore 16 .
- the tapered outer surface 26 of the collar becomes frictionally locked with tapered surface 17 of bore 16 . As described above, this is known as the Morse Taper effect.
- Locking collar 24 has a tapered outer surface 26 , with a distal end 19 , having the major diameter, and a proximal end 23 , having the minor diameter.
- the distal end comprises a flat outer face designed to correspond to the flat underside of the head of a compression screw (not shown).
- a circumferential lip 28 is provided at distal end 19 for engaging a groove on the internal bore of the side plate (see FIGS. 1 and 2 ).
- Collar 24 also has a keyed internal profile 21 , for mating with a corresponding keyed cross-sectional profile on the lag screw (not shown), and a plurality of lengthwise slots 27 extending from the distal end 19 toward the proximal end 23 . These slots 27 facilitate disengagement of the circumferential lip 28 from the circumferential groove on the internal bore of the side plate (not shown), after the lag screw is satisfactorily engaged with the bone. As discussed above, the collar 24 facilitates alignment and ensures proper orientation of the lag screw, while allowing the screw to rotate freely so that its drilling portion 20 can engage its respective bone fragment during installation.
- the locking collar may be formed of stainless steel, titanium, or any other material with suitable strength and bio-compatible characteristics.
- FIG. 4 demonstrates the application of the device of the present invention to repair a fracture of the femoral neck (i.e., hip).
- the assembled device 40 is used to join two bone segments 41 , 42 (i.e., the femoral head and the femoral shaft).
- a lag screw 18 having a bone-engagement end, a distal end, and a keyed cross-sectional profile over part of its length is provided.
- the bone-engagement end of lag screw 18 is configured for engaging first bone segment 41 and the distal end has a threaded bore.
- a side plate 10 is provided having a flat portion for engaging second bone segment 42 and an angled barrel portion 14 with an internal bore for slidably receiving the lag screw.
- a portion of the internal bore (not shown) has a taper and a distal end of the internal bore has a circumferential groove.
- a cylindrical locking collar (not shown) is also provided.
- the collar has a hollowed cylindrical interior, an outer surface formed with a taper defined by a major diameter and a minor diameter, a distal end of the collar having the major diameter, a proximal end of the collar having the minor diameter, a circumferential lip at the distal end for engaging the circumferential groove of the internal bore, and a keyed internal profile.
- the system is assembled by inserting the cylindrical locking collar into the internal bore of the bone plate so that it rotatably engages the internal bore.
- the system may be supplied to physicians with the locking collar already engaged in the internal bore of the bone plate, thus eliminating the need for physicians or technicians to insert the collar into the bore of the bone plate.
- the lag screw 18 is inserted into the locking collar, such that the keyed cross-sectional profile of the lag screw mates with the keyed internal profile of the locking collar to rotationally couple the locking collar and the lag screw.
- the distal end of the locking collar (not shown) is impacted using a mallet-type instrument, frictionally locking the collar within the angled barrel portion 14 of the side plate 10 .
- This frictional locking known as the Morse Taper effect, prevents further rotation of the collar relative to the bone plate, and thereby prevents further rotation of the lag screw relative to the bone plate.
- the collar is locked in place by a force in the distal direction, such as that applied by a slap-hammer.
- the side plate 10 would typically be anchored to the femoral shaft 42 using bone screws 44 (formed of stainless steel or titanium alloy).
- a compression screw 34 would then be inserted into the threaded bore (see FIG. 1) of the lag screw, abutting the locking collar and axially drawing bone segment 41 toward bone segment 42 (see FIG. 4 ).
- the side plate 10 may be affixed to the femoral shaft prior to impact of the locking collar.
Abstract
Description
Claims (31)
Priority Applications (16)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/542,821 US6533789B1 (en) | 2000-04-04 | 2000-04-04 | Device for rotational stabilization of bone segments |
AU2001237191A AU2001237191B2 (en) | 2000-04-04 | 2001-03-15 | Device for rotational stabilization of bone segments |
DE60134217T DE60134217D1 (en) | 2000-04-04 | 2001-03-15 | DEVICE FOR ROTATION STABILIZATION OF BONE FRAGMENTS |
ES01909400T ES2306703T3 (en) | 2000-04-04 | 2001-03-15 | DEVICE FOR THE ROTATIONAL STABILIZATION OF OSE SEGMENTS. |
EP01909400A EP1267734B1 (en) | 2000-04-04 | 2001-03-15 | Device for rotational stabilization of bone segments |
AT01909400T ATE396656T1 (en) | 2000-04-04 | 2001-03-15 | DEVICE FOR ROTATIONAL STABILIZATION OF BONE FRAGMENTS |
BRPI0109772A BRPI0109772B8 (en) | 2000-04-04 | 2001-03-15 | device for rotational stabilization of bone segment. |
CA002405156A CA2405156C (en) | 2000-04-04 | 2001-03-15 | Device for rotational stabilization of bone segments |
MXPA02009692A MXPA02009692A (en) | 2000-04-04 | 2001-03-15 | Device for rotational stabilization of bone segments. |
AU3719101A AU3719101A (en) | 2000-04-04 | 2001-03-15 | Device for rotational stabilization of bone segments |
PCT/CH2001/000160 WO2001074261A1 (en) | 2000-04-04 | 2001-03-15 | Device for rotational stabilization of bone segments |
JP2001572008A JP4961086B2 (en) | 2000-04-04 | 2001-03-15 | Bone segment rotation stabilization device |
CNB018074146A CN1267063C (en) | 2000-04-04 | 2001-03-15 | Device for rotational stabilization of bone segments |
ARP010101369A AR028279A1 (en) | 2000-04-04 | 2001-03-23 | BONE SEGMENT STABILIZATION DEVICE |
US09/968,562 US6645209B2 (en) | 2000-04-04 | 2001-10-01 | Device for rotational stabilization of bone segments |
ZA200207138A ZA200207138B (en) | 2000-04-04 | 2002-09-05 | Device for ratational stabilization of bone segments. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/542,821 US6533789B1 (en) | 2000-04-04 | 2000-04-04 | Device for rotational stabilization of bone segments |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/968,562 Continuation-In-Part US6645209B2 (en) | 2000-04-04 | 2001-10-01 | Device for rotational stabilization of bone segments |
Publications (1)
Publication Number | Publication Date |
---|---|
US6533789B1 true US6533789B1 (en) | 2003-03-18 |
Family
ID=24165419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/542,821 Expired - Lifetime US6533789B1 (en) | 2000-04-04 | 2000-04-04 | Device for rotational stabilization of bone segments |
Country Status (14)
Country | Link |
---|---|
US (1) | US6533789B1 (en) |
EP (1) | EP1267734B1 (en) |
JP (1) | JP4961086B2 (en) |
CN (1) | CN1267063C (en) |
AR (1) | AR028279A1 (en) |
AT (1) | ATE396656T1 (en) |
AU (2) | AU2001237191B2 (en) |
BR (1) | BRPI0109772B8 (en) |
CA (1) | CA2405156C (en) |
DE (1) | DE60134217D1 (en) |
ES (1) | ES2306703T3 (en) |
MX (1) | MXPA02009692A (en) |
WO (1) | WO2001074261A1 (en) |
ZA (1) | ZA200207138B (en) |
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Also Published As
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---|---|
AU2001237191B2 (en) | 2005-07-21 |
EP1267734B1 (en) | 2008-05-28 |
ATE396656T1 (en) | 2008-06-15 |
WO2001074261A1 (en) | 2001-10-11 |
JP2003528685A (en) | 2003-09-30 |
CA2405156A1 (en) | 2001-10-11 |
ZA200207138B (en) | 2003-05-06 |
JP4961086B2 (en) | 2012-06-27 |
CN1267063C (en) | 2006-08-02 |
CN1420747A (en) | 2003-05-28 |
AU3719101A (en) | 2001-10-15 |
EP1267734A1 (en) | 2003-01-02 |
BR0109772A (en) | 2003-02-04 |
BRPI0109772B8 (en) | 2021-06-22 |
BR0109772B1 (en) | 2011-11-01 |
CA2405156C (en) | 2007-08-21 |
DE60134217D1 (en) | 2008-07-10 |
AR028279A1 (en) | 2003-04-30 |
ES2306703T3 (en) | 2008-11-16 |
MXPA02009692A (en) | 2003-03-27 |
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